hchaverri commented on code in PR #5897:
URL: https://github.com/apache/hadoop/pull/5897#discussion_r1278035871
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/SQLDelegationTokenSecretManager.java:
##########
@@ -46,6 +50,9 @@ public abstract class
SQLDelegationTokenSecretManager<TokenIdent
private static final String SQL_DTSM_TOKEN_SEQNUM_BATCH_SIZE =
SQL_DTSM_CONF_PREFIX
+ "token.seqnum.batch.size";
public static final int DEFAULT_SEQ_NUM_BATCH_SIZE = 10;
+ public static final String SQL_DTSM_TOKEN_LOADING_CACHE_EXPIRATION_MS =
SQL_DTSM_CONF_PREFIX
+ + "token.loading.cache.expiration.ms";
+ public static final int SQL_DTSM_TOKEN_LOADING_CACHE_EXPIRATION_DEFAULT_MS =
10000;
Review Comment:
The concern is not only with deleting tokens from SQL that have been
renewed, but also with tokens being stale in the cache. If a router has a stale
token that has been renewed somewhere else, the router will throw an
authentication error since the token in memory is expired. We should keep this
value low enough so the renewal is propagated to all routers quickly enough.
Same reason for cancellations. I can see us tweaking this value to balance the
impact on SQL.
The removal scan won't actually help much with token cleanup as we only
expect 10 seconds of tokens to be candidates for cleanup. We need a separate
mechanism to query SQL for all expired tokens and delete them, but I think we
should track that separately.
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